EP0272450B2 - Dispositif pour le test de plaquettes de circuit imprimé - Google Patents

Dispositif pour le test de plaquettes de circuit imprimé Download PDF

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Publication number
EP0272450B2
EP0272450B2 EP87116895A EP87116895A EP0272450B2 EP 0272450 B2 EP0272450 B2 EP 0272450B2 EP 87116895 A EP87116895 A EP 87116895A EP 87116895 A EP87116895 A EP 87116895A EP 0272450 B2 EP0272450 B2 EP 0272450B2
Authority
EP
European Patent Office
Prior art keywords
centering
adapter
printed circuit
carrier plate
circuit board
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP87116895A
Other languages
German (de)
English (en)
Other versions
EP0272450A1 (fr
EP0272450B1 (fr
Inventor
Martin Maelzer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ATG Luther and Maelzer GmbH
Original Assignee
Luther and Maelzer GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by Luther and Maelzer GmbH filed Critical Luther and Maelzer GmbH
Priority to AT87116895T priority Critical patent/ATE81209T1/de
Publication of EP0272450A1 publication Critical patent/EP0272450A1/fr
Application granted granted Critical
Publication of EP0272450B1 publication Critical patent/EP0272450B1/fr
Publication of EP0272450B2 publication Critical patent/EP0272450B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/28—Testing of electronic circuits, e.g. by signal tracer
    • G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
    • G01R31/2806—Apparatus therefor, e.g. test stations, drivers, analysers, conveyors
    • G01R31/2808—Holding, conveying or contacting devices, e.g. test adapters, edge connectors, extender boards
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/02—General constructional details
    • G01R1/06—Measuring leads; Measuring probes
    • G01R1/067—Measuring probes
    • G01R1/073—Multiple probes
    • G01R1/07307—Multiple probes with individual probe elements, e.g. needles, cantilever beams or bump contacts, fixed in relation to each other, e.g. bed of nails fixture or probe card
    • G01R1/07364—Multiple probes with individual probe elements, e.g. needles, cantilever beams or bump contacts, fixed in relation to each other, e.g. bed of nails fixture or probe card with provisions for altering position, number or connection of probe tips; Adapting to differences in pitch
    • G01R1/07371—Multiple probes with individual probe elements, e.g. needles, cantilever beams or bump contacts, fixed in relation to each other, e.g. bed of nails fixture or probe card with provisions for altering position, number or connection of probe tips; Adapting to differences in pitch using an intermediate card or back card with apertures through which the probes pass
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/02—General constructional details
    • G01R1/06—Measuring leads; Measuring probes
    • G01R1/067—Measuring probes
    • G01R1/073—Multiple probes
    • G01R1/07307—Multiple probes with individual probe elements, e.g. needles, cantilever beams or bump contacts, fixed in relation to each other, e.g. bed of nails fixture or probe card
    • G01R1/07364—Multiple probes with individual probe elements, e.g. needles, cantilever beams or bump contacts, fixed in relation to each other, e.g. bed of nails fixture or probe card with provisions for altering position, number or connection of probe tips; Adapting to differences in pitch
    • G01R1/07378—Multiple probes with individual probe elements, e.g. needles, cantilever beams or bump contacts, fixed in relation to each other, e.g. bed of nails fixture or probe card with provisions for altering position, number or connection of probe tips; Adapting to differences in pitch using an intermediate adapter, e.g. space transformers

Definitions

  • the invention relates to a device according to the preamble of claim 1.
  • circuit board to be tested is arranged in an exact, exactly reproducible position below the adapter, which in most cases has test pins, so that the contact points of the adapter, e.g. the tips of the test pins, the contact points or test points assigned to them on the circuit board.
  • a device of the type described in the opening paragraph is known from DE-A-3 511 821 and is also the subject of an older proposal by the applicant.
  • the printed circuit board is centered at the test point between frame-shaped guide rails. It is therefore necessary to make the dimensions of the circuit boards to be tested reproducibly the same so that they fit exactly between the frame-shaped guide rails.
  • the fitting (centering or positioning) of the circuit boards to be tested is associated with a considerable amount of work. The same applies to the exact dimensioning of the frame-shaped guide rails and the circuit boards to be tested. In the event of deviations from the fit dimensions, fitting is not possible, or contacting difficulties arise due to both an incorrectly fitted circuit board and an inadmissibly large clearance.
  • test adapter The principle of centering the circuit board on a conveyor element and the subsequent alignment of the circuit board with respect to the test adapter is also known, for example, from GB 1 384 550 or DE-AS 2 163 970.
  • the adapter cannot be replaced in these publications.
  • these test devices can only test printed circuit boards of a single specific dimension.
  • the invention has for its object to improve the supply of the circuit board in a device of the type mentioned while ensuring a simple and easy-to-use feeding and alignment of the circuit board relative to the adapter.
  • the design according to the invention enables the circuit board to be tested to be transferred from the insertion point to the test site on the one hand by means of controlled conveyance at a possibly predeterminable speed, which can be predetermined by a corresponding drive for the conveyor of the invention, and on the other hand indirectly in a prepositioned position by a Support plate in which it can be easily inserted.
  • the circuit board to be tested is locked or centered in relation to the support plate when the circuit board is inserted at the insertion point, so that the circuit board does not slip during transport to the test center.
  • both the printed circuit board and the adapter are aligned at the test site using one and the same centering device. On the one hand, this ensures optimal alignment of the circuit board with respect to the adapter; on the other hand, an additional centering device for the interchangeable adapter is therefore unnecessary and can therefore be saved.
  • test device With the help of the test device according to the invention, it is also possible that circuit boards of different dimensions can be tested, since the centering devices on the support plate and at the test point enable the circuit boards and the adapter to be exchanged without the centering devices having to be rearranged when the dimensions change .
  • Claims 2 to 24 contain features which lead to simple, space-saving and expedient construction methods and / or movement drives or guides, as a result of which cost-effective production is possible with safe and precise function.
  • the invention is explained in more detail below on the basis of preferred exemplary embodiments illustrated in simplified drawings.
  • the device generally designated 1 in FIG. 1 has a frame 2 with two side legs 3 in the form of a table. Arranged on an upper cross member 4 is also a table-shaped receiving device 5 for circuit boards 6 to be tested, shown in FIG. 2, which protrudes toward the operating side 7 of the device 1.
  • the frame 2 on the one hand and on the other hand the receiving device 5, a bearing block 8 arranged on the right side and a bearing wall 9 arranged on the left side with two bearing blocks 10 located one behind the other at a height as seen from the operating side 7 form two components connected by bolts to form a structural unit.
  • the holding frame designated 11 for the electronic test device 12 and the adapter 13 can be pivoted about an axis 14 which is horizontally arranged laterally to the right by means of a cylinder piston unit 15 between the folded-up position shown in FIG. 1 and the working position shown in FIG. 2.
  • the holding frame 11 is both centered and fixed by a cylinder-piston unit integrated in a block 16 with two pistons 17 acting in opposite directions, which engage in corresponding centering receptacles 18 of the bearing blocks 10.
  • the receiving device 5 has a conveyor, generally designated 20, by means of which the printed circuit board 6 can be moved back and forth between a test point, generally designated 21 in FIG. 4, and an input point 22 which is offset relative to the latter on the operating side 7.
  • the displacement directions are shown by the double arrow 23.
  • the displacement of the circuit board 6 takes place on a support plate 24, with a greater length and width than the circuit board 6.
  • the support plate 24 has essentially diagonally opposite upwardly directed centering pins 25 which are fastened to the support plate 24 by insertion, gluing or also integral molding can be, and surround the correspondingly dimensioned centering holes 26 in the circuit board 6.
  • the cross section of the centering pin 25 and the centering holes 26 is preferably round.
  • the centering pin 25 are preferably arranged so that they lie in the area of the smallest circuit board, so that both small and large circuit boards can be centered with one and the same centering pin 25 and holes 26. Placing the respective printed circuit board 6 is unproblematic since it can be held or guided in a simple manner on its circumference and the centering pin also has inclined surfaces, e.g. may have in the form of a truncated cone or truncated cone (not shown).
  • the printed circuit board 6 and the support plate 24 are shown in FIG. 4, while at the test point 21 they are indicated by dash-dotted lines.
  • the arrangement is such that between the adapter 13, i.e. there is a distance a between its contact points, which in the present exemplary embodiment are formed by the tips of test pins 27.
  • prepositioning members or edges 28 preferably with run-in bevels 29, which can be formed by strips fastened to a plate 30 of the receiving device 5 and which limit the support plate 24 with lateral play.
  • the conveyor 20 is formed by endless conveyor belts 32 rotating around rollers 31 or rollers, four of which are arranged at a distance from one another in the present exemplary embodiment and slide on horizontal plate 30 of the receiving device 5.
  • a drive for the conveyor 20 which is effective on at least one roller 31 is not shown for reasons of simplification.
  • first pressure plate 35 In the plate 33 in the area of the test station 21, three pressure bars 34 are let in vertically displaceably and are arranged on a first pressure plate 35. Below the first pressure gap 35 there is a second pressure plate 36, four pressure bellows 37 known per se being arranged between the first and the second pressure plate 35, 36 in the corners of the pressure plates 35, 36. Below the second pressure plate 36 there is a pressure member 38 which can be pivoted in the direction of the double arrow 42 about an axis 39 (FIG. 4) by means of the cylinder-piston units 41 which are only partially shown in FIGS. 1 and 2.
  • the adapter 13 is accommodated in an adapter guide, generally designated 45, which is designed in the form of a drawer and into which the adapter 13 can be inserted from the operating side 7.
  • the guide strips 46 of the guide 45 which are indicated in FIGS. 4 and 5, are vertically displaceable together by four laterally arranged cylinder-piston units 47, namely between a lower displacement position and a higher centered and fixed working position. The stroke is about 10 mm.
  • the adapter 13 is centered by means of two diagonally opposite cylindrical, conically tapered centering bolts 48 which extend vertically and can each be displaced by a cylinder piston unit 49 between a raised release position and a centering position pushed down into a correspondingly shaped centering hole 51 in the adapter 13. 4, the centering bolts 48 are in their release position, while according to FIG. 5 they are in their centering position pushed into the adapter 13.
  • This centering device is generally designated 52.
  • centering device 53 In the area of the test station 21 there is also a centering device, generally designated 53, consisting likewise of two cylindrical centering bolts 55, each of which can be displaced axially and vertically by means of a cylinder-piston unit 54, the free ends of which point downwards are also tapered, and which are used to center the support plate 24 serve at the testing center 21.
  • the centering bolts 55 In their release position, the centering bolts 55 are located above the support plate 24 (see dashed line in FIG. 4), and in their centering position they are actively or passively shifted into correspondingly shaped centering holes 56 in the support plate 24 (FIG. 5).
  • the centering bolts 55 are arranged on the rear of the holding frame 11 or the support plate 24, so that only one centering pin 55 is visible in FIG. 4.
  • the assignment of the centering devices and the stops 43 can be seen in the plan view according to FIG. 3.
  • the cylinder piston units 47, 49 and 54 or the associated guide strips 46 and centering bolts 48 and 55 or their movable elements can advantageously be centered or guided on a horizontal support plate 57 which is fastened to the holding frame 11 and also the electronic test device 12 carries, which is centered and fixed relative to the support plate 52.
  • interchangeable adapters 13 belong to the present device 1, it is initially assumed that a suitable adapter 13 is to be used.
  • the adapter 13 is inserted into its guide 45, centering bolts 48, 55 being in their raised position and the guide strips 46 being in their lower position.
  • the latter is necessary because the heads designated 61, preferably spherical heads, of the test pins 27 when inserting and also pulling out the adapter 13 must be located below contact elements in the form of contact crowns 62 of the electronic test device 12 which pass through the carrier plate 57.
  • the adapter 13 is pulled up by means of the cylinder piston units 47 to such an extent that the heads 61 contact the contact crowns 62, the contact crowns 62 being inserted slightly against a spring force (not shown).
  • the adapter 13 is centered by pushing down the centering bolts 48 and fixed in a manner not shown.
  • a circuit board 6 To test a circuit board 6, it is placed at the input point 22 on the support plate 24 located there and at the same time centered by the centering pins 25 and holes 26, which form a centering device, generally designated 40.
  • the support plate itself is pre-positioned by the prepositioning edges 28 with lateral movement play. In this position, the support plate 24 with the printed circuit board 6 is advanced through the conveyor 20 to the test station 22. It is possible to determine the conveying path as part of the prepositioning, or to push the support plate 24 against the stops 43 and to reposition it.
  • the pressure bars 34 are raised by actuating the cylinder piston units 41, the pressure member 31 pressing essentially centrally against the second pressure plate 36 by means of a central elevation, which acts uniformly against the first pressure plate 35 and thus against the pressure bars 34 via the four pressure bellows 37.
  • the pressure bars 34 can be raised because there is a distance between the middle and the outer of the three pressure bars 34, in which the two middle conveyor belts 32 passively dip.
  • the outer pressure strips 34 move past the two outer conveyor belts 32.
  • the support plate 24 and the circuit board 6 are raised by means of the rising pressure bars 34 so that the tips 64 of the test pins 27 contact the test points of the circuit board 6, not shown (FIG. 5).
  • the start-up can take place so far that the top side of the circuit board 6 rests on the underside of the adapter 13, the test pins 27 and the contact crowns 62 being moved up.
  • the centering of the support plate 24 is carried out by pushing the centering bolts 55 down into the centering holes 56 or pushing the latter onto centering bolts 55 which have not been displaced in this case.
  • the test is carried out in this raised position of the printed circuit board 6.
  • circuit board 6 is moved down by swiveling the pressure member 38 down until the support plate 24 rests on the conveyor belts 32, the centering bolts 55 being actively or passively pulled out of the centering holes 56.
  • the lugs 44 can act as wipers.
  • the carrying plate 24 is then returned by means of the conveyor 20 to the input point 22, where the printed circuit board 6 can be removed.
  • the circuit board 6 can be input and / or removed manually or automatically by a device.
  • centering device 53 An important feature of the centering device 53 is that the centering bolts 55 simultaneously grip the adapter 13 in correspondingly shaped centering holes 65. In this case, it is advantageous to simultaneously drill a lowermost guide plate 66 of the adapter 13 (not shown) consisting of a plurality of guide plates arranged one above the other with respect to the centering holes 56 and 65, so that there is an accurate indexing of the adapter 13 relative to the support plate 24 and thus also the circuit board 6 results.
  • centering bolts 48 for centering the support plate 24, all that is required is a corresponding arrangement of centering holes in the support plate 24 and a corresponding stroke length and control of the cylinder piston units 49.
  • the additional centering device 53 is for reasons of space utilization and for control purposes Reasons provided.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • General Engineering & Computer Science (AREA)
  • Tests Of Electronic Circuits (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Claims (26)

  1. Appareil pour le contrôle de points de contrôle disposés en réseau et/ou hors réseau d'une carte à circuit imprimé au moyen d'un dispositif d'adaptation (13) qui, lors du contrôle, est placé entre des organes de contact (62) d'un dispositif de contrôle (12) électronique et la carte à circuit imprimé (6) se trouvant à un poste de contrôle (21), appareil comportant un dispositif de réception (5) en forme de table pour la carte à circuit imprimé (6), un cadre porteur (11) pour le dispositif d'adaptation (13) et le dispositif de contrôle (12) qui est disposé au-dessus du dispositif de réception, un plateau porteur (24) mobile recevant la carte à circuit imprimé (6), sur lequel ladite carte à circuit imprimé (6) est centrée au moyen d'un premier dispositif de centrage (40), le plateau porteur (24) étant amené par un dispositif de transport (20) comportant au moins un organe de transport (32) mobile d'un poste de chargement (22) vers un poste de contrôle (21) dans une position préétablie, et un deuxième dispositif de centrage (53) du plateau porteur (24) dans la région du poste de contrôle (21), caractérisé par le fait que le deuxième dispositif de centrage (53) permet de psotionner aussi bien le plateau porteur (24) que le dispositif d'adaptation (13) par rapport au dispositif de contrôle (12) électronique.
  2. Appareil selon la revendication 1, caractérisé par le fait que le deuxième dispositif de centrage (53) est constitué par une première broche de centrage de section non circulaire mobile verticalement ou par deux premières broches de centrage (55) mobiles verticalement qui comportent chacune des surfaces de centrage inclinées (extrémités coniques) et s'engagent avec possibilité de retrait dans un trou de centrage (56) de section adaptée prévu dans le plateau porteur (24).
  3. Appareil selon la revendication 1 ou 2, caractérisé par le fait que le premier dispositif de centrage (40) est constitué de préférence par deux tourillons (25), de préférence de section circulaire, fixés sur le plateau porteur (24) et par des trous de centrage (26) de section adaptée prévus dans la carte à circuit imprimé (6).
  4. Appareil selon l'une des revendications 1 à 3, caractérisé par le fait que les premières broches de centrage (55) ont une section cylindrique et comportent une extrémité pointue conique.
  5. Appareil selon l'une des revendications 1 à 4, caractérisé par le fait que les premières broches de centrage (55) sont déplacées par au moins un ensemble piston-cylindre (54) hydraulique ou pneumatique.
  6. Appareil selon l'une des revendications 1 à 5, caractérisé par le fait que les premières broches de centrage (55) traversent également le dispositif d'adaptation (13) par des trous de centrage (65) prévus dans ce dernier.
  7. Appareil selon l'une des revendications 1 à 6, caractérisé par le fait que les premières broches de centrage (55) sont montées sur le côté arrière du cadre porteur (11) ou du plateau porteur (24).
  8. Appareil selon l'une des revendications 1 à 7, caractérisé par le fait que le dispositif d'adaptation (13) peut être introduit dans un dispositif de guidage (45) de type tiroir.
  9. Appareil selon la revendication 8, caractérisé par le fait que le dispositif de guidage (45) peut être relevé et abaissé de préférence par des moyens hydrauliques ou pneumatiques et peut être centré et bloqué en position relevée.
  10. Appareil selon la revendication 8 ou 9, caractérisé par le fait qu'il est prévu en plus, pour le centrage du dispositif de guidage (45) ou du dispositif d'adaptation (13), deux deuxièmes broches de centrage (48) mobiles verticalement qui s'engagent avec possibilité de retrait dans des trous de centrage (65 ou 51) de section adaptée aménagés dans le dispositif d'adaptation (13).
  11. Appareil selon la revendication 10, caractérisé par le fait que les deuxièmes broches de centrage (48) ont également une section circulaire et présentent une extrémité conique.
  12. Appareil selon la revendication 10 ou 11, caractérisé par le fait que les deuxièmes broches de centrage (48) sont disposées en diagonale par rapport au cadre porteur (11).
  13. Appareil selon l'une des revendications 1 à 12, caractérisé par le fait que le dispositif d'adaptation (13) est constitué par au moins deux plaques de guidage disposées l'une au-dessus de l'autre et que les trous de centrage (65) dans la plaque de guidage (66) inférieure et les trous de centrage (56) dans le plateau porteur (24) sont percés simultanément.
  14. Appareil selon l'une des revendications 1 à 13, caractérisé par le fait que les ensembles piston-cylindre (54) pour les premières broches de centrage (55), les ensembles piston-cylindre (49) pour les deuxièmes broches de centrage (48) et/ou les ensembles piston-cylindre (47) pour les barrettes de guidage (46) sont montés sur un plateau support (57).
  15. Appareil selon l'une des revendications 1 à 14, caractérisé par le fait que le dispositif de transport (20) est constitué par une, de préférence au moins deux bandes transporteuses (32) parallèles.
  16. Appareil selon la revendication 15, caractérisé par le fait que la ou les bandes transporteuse(s) (32) est(sont) une(des) bande(s) transporteuse(s) qui circule(nt) sur des roues ou des galets (31).
  17. Appareil selon l'une des revendications 1 à 16, caractérisé par le fait qu'au moins un élément presseur (34) mobile verticalement est disposé dans la région du poste de contrôle (21) en-dessous du plateau porteur (24).
  18. Appareil selon la revendication 17, caractérisé par le fait que l'élément presseur (34) peut être déplacé vers le haut par un organe de pression (38) qui agit de préférence au centre d'un plateau de pression (36) disposé sous l'élément presseur (34), des éléments élastiques qui se présentent de préférence sous la forme de soufflets de pression (37) étant disposés entre ledit plateau de pression (36) et l'élément presseur (34, 35).
  19. Appareil selon la revendication 17 ou 18, caractérisé par le fait que l'élément presseur est formé de plusieurs barrettes de pression (34) qui s'étendent le long de la bande transporteuse (32) au nombre d'au moins une.
  20. Appareil selon l'une des revendications 1 à 19, caractérisé par le fait que des points ou des bords de pré-positionnement (28), entre lesquels le plateau porteur (24) est reçu avec jeu, sont disposés de part et d'autre du poste de chargement (22).
  21. Appareil selon l'une des revendications 1 à 20, caractérisé par le fait qu'au moins une butée (43) pour le plateau porteur (24) est associée au poste de contrôle (21).
  22. Appareil selon la revendication 21, caractérisé par le fait qu'un dispositif de serrage ou un extracteur (44) est associé au le plateau porteur (24) dans la région du poste de contrôle (21).
  23. Appareil notamment selon l'une des revendications 1 à 22, caractérisé par le fait que le cadre porteur (11) est agencé de manière à pouvoir être relevé.
  24. Appareil selon la revendication 23, caractérisé par le fait que le cadre porteur (11) peut pivoter autour d'un axe latéral (14) parallèle à la direction de transport (23).
  25. Appareil selon la revendication 23 ou 24, caractérisé par le fait que le cadre porteur (11), dans sa position de travail rabattue vers le bas, est centré et bloqué du côté opposé à son axe (14) par des éléments de centrage et de positionnement (17).
  26. Appareil selon la revendication 25, caractérisé par le fait qu'il est prévu une, de préférence deux broches de centrage et de positionnement (17) qui sont commandées par des moyens hydrauliques ou pneumatiques.
EP87116895A 1986-11-18 1987-11-16 Dispositif pour le test de plaquettes de circuit imprimé Expired - Lifetime EP0272450B2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87116895T ATE81209T1 (de) 1986-11-18 1987-11-16 Geraet zum pruefen von leiterplatten.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863639361 DE3639361A1 (de) 1986-11-18 1986-11-18 Geraet zum pruefen von leiterplatten
DE3639361 1986-11-18

Publications (3)

Publication Number Publication Date
EP0272450A1 EP0272450A1 (fr) 1988-06-29
EP0272450B1 EP0272450B1 (fr) 1992-09-30
EP0272450B2 true EP0272450B2 (fr) 1995-10-18

Family

ID=6314196

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87116895A Expired - Lifetime EP0272450B2 (fr) 1986-11-18 1987-11-16 Dispositif pour le test de plaquettes de circuit imprimé

Country Status (4)

Country Link
US (1) US4829241A (fr)
EP (1) EP0272450B2 (fr)
AT (1) ATE81209T1 (fr)
DE (2) DE3639361A1 (fr)

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Also Published As

Publication number Publication date
EP0272450A1 (fr) 1988-06-29
DE3639361A1 (de) 1988-05-19
ATE81209T1 (de) 1992-10-15
EP0272450B1 (fr) 1992-09-30
DE3782014D1 (de) 1992-11-05
US4829241A (en) 1989-05-09

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